The Chemical Educator最新文献

Analysis of Gatorade as a Teaching Tool in the Non-Science Majors Chemistry Lab; A Variety of Modules to Consider 非理科生化学实验中佳得乐作为教学工具的分析要考虑的各种模块

The Chemical Educator Pub Date : 2022-02-01 DOI: 10.1333/s00897222955a

Laura Herder, Jared Baysinger, Michael J. Samide, Samuel Watters, Anne M. Wilson

引用次数: 0

Investigating the Seed-Growth Method for the Synthesis of Silver Sols with Several Colors 种子生长法合成多色银溶胶的研究

The Chemical Educator Pub Date : 2018-03-01 DOI: 10.1333/S00897182788A

Ignace De Coninck, Dries Curvers, Natalie Chiaverini, Tom Mortier

引用次数: 0

Determining Micro- and Macro Metals by Flame Atomic Absorption Spectrometry 火焰原子吸收光谱法测定微量和宏量金属

The Chemical Educator Pub Date : 2016-02-01 DOI: 10.1333/s00897162724a

Shakeena L. Walker, Ben Stevenson, Jordhan Peterson, George L. Donati, Bradley T. Jones, Marilyn Tourne, D. Pollard, A. Bakarr Kanu

{"title":"Determining Micro- and Macro Metals by Flame Atomic Absorption Spectrometry","authors":"Shakeena L. Walker, Ben Stevenson, Jordhan Peterson, George L. Donati, Bradley T. Jones, Marilyn Tourne, D. Pollard, A. Bakarr Kanu","doi":"10.1333/s00897162724a","DOIUrl":"https://doi.org/10.1333/s00897162724a","url":null,"abstract":"The monitoring of micro- and macro minerals in food and other samples is essential for protecting public health against the hazards of metal toxicity. In this study, experimental protocols were designed to enable undergraduate students interested in research to develop laboratory techniques via hands-on-experience in the analysis of food, water, vitamins/dietary supplements, and toy samples using flame atomic absorption spectrometry (FAAS). Levels of Ca, Cd, Cr, Mg, Fe, and Pb were determined in unknown samples by FAAS. In addition to having students develop techniques in analyzing metal levels in different unknown samples, this project also enabled undergraduate students to better understand the principles and practical operations of FAAS. The limit of detection (LOD) determined for reference standards ranged from 0.003 to 0.12 µg g-1 whereas the limit of quantification (LOQ) determined for reference standards ranged from 0.01 to 0.94 µg g-1 using the FAAS instrument. Some of the food and vitamins/dietary supplements showed levels of micro metals well above the provisional tolerable weekly intake (PTWI) value recommended by the Food and Agriculture Organization of the United Nations and World Health Organization (FAO/WHO). In addition, some vitamins/dietary supplements showed metal levels not reported on the labels. Using the amount of metals reported on labels for some of the unknown samples, percent error was calculated. The percent error calculated falls in the range of 0.31% to 8.92% indicating our determination was within acceptable limits.","PeriodicalId":22396,"journal":{"name":"The Chemical Educator","volume":"21 1","pages":"264-272"},"PeriodicalIF":0.0,"publicationDate":"2016-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147921396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurement of Mercury Levels in a Commercial Fish Oil Brand by Inductively Coupled Plasma Mass Spectrometry 用电感耦合等离子体质谱法测定某商业鱼油品牌的汞含量

The Chemical Educator Pub Date : 2015-02-01 DOI: 10.1333/s00897152644a

Abu B. Kanu, Keith E. Levine, Laura Haines, Monique Massey, TeAsia Codio

{"title":"Measurement of Mercury Levels in a Commercial Fish Oil Brand by Inductively Coupled Plasma Mass Spectrometry","authors":"Abu B. Kanu, Keith E. Levine, Laura Haines, Monique Massey, TeAsia Codio","doi":"10.1333/s00897152644a","DOIUrl":"https://doi.org/10.1333/s00897152644a","url":null,"abstract":"One of the most important heavy metals to consider in food chain contamination is mercury (Hg). Fish oil consumption has long since been associated with decreased risk of coronary artery disease. On the other hand, fish oil intake has been reported to be a major source of exposure to organic Hg, since most fish contain methyl-mercury. There is however very little data available in the literature concerning levels of Hg in fish oil supplements. Because of the high toxicity levels of Hg, these data may prove critical if physicians continue to recommend fish oil supplements to patients with coronary artery disease, bipolar and affective disorders, and for cardio-protective benefits in the general population. In this study, undergraduate students were instructed to use a quality assurance (QA) approach with inductively coupled plasma mass spectrometry (ICP-MS) to investigate levels of Hg in a fish oil supplement brand sold over the internet. Levels of Hg reported in the fish oil supplement product chosen at random from three bottles were 12, 5, and 3 times higher than the recommended provisional tolerable weekly intake (PTWI) values set by the Food and Agriculture Organization of the United Nations and World Health Organization (FAO/WHO). These levels may pose health risks to consumers if these products are consumed above 3000 g (approximately 4300 capsules) per week. This work demonstrates there is a need to develop regular screening methods for pharmaceutical products and such methods are needed for students trying to learn the approach. Our experimental approach will be incorporated into an instrumental analysis class as part of a guided-inquiry (GI) lab. Such labs have been reported to enhance student learning and improve students’ critical and problem-solving ability.","PeriodicalId":22396,"journal":{"name":"The Chemical Educator","volume":"20 1","pages":"234-239"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147913840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Sublimation Experiment with Unknowns 未知升华实验

The Chemical Educator Pub Date : 2014-02-01 DOI: 10.1333/s00897142542a

Kate J. Graham, Abdimahad S. Nur, Chris P. Schaller

引用次数: 1

A Low-Cost Method for Measuring the Permeability of a Pharmaceutical Drug in a Diffusion Cell 一种在扩散池中测量药物渗透性的低成本方法

The Chemical Educator Pub Date : 2014-01-01 DOI: 10.1333/S00897142584A

Megan Kitson, Heather N. Sheppard, Joanne C. Morris, N. Howarth, A. Kraft

引用次数: 0

Less Cookbook and More Research! Synthetic Efforts Toward JBIR-94 and JBIR-125: a Student-Designed Research Project in a Sophomore Organic Chemistry Lab 少写食谱，多做研究!合成JBIR-94和JBIR-125的努力:二年级有机化学实验室学生设计的研究项目

The Chemical Educator Pub Date : 2014-01-01 DOI: 10.1007/S00897132528A

M. A. Christiansen, C. L. Crawford, C. D. Mangum